ISO/DTS 23818-1

FINAL DRAFT
Technical
Specification
ISO/TC 138/SC 8
Assessment of conformity of
Secretariat: JISC
plastics piping systems for
Voting begins on:
the rehabilitation of existing
2025-11-05
pipelines —
Voting terminates on:
2026-01-28
Part 1:
Polyethylene (PE) material
Évaluation de la conformité des systèmes de canalisations en
plastique destinés à la réhabilitation des réseaux existants —
Partie 1: Matériau Polyéthylène (PE)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
Technical
Specification
ISO/TC 138/SC 8
Assessment of conformity of
Secretariat: JISC
plastics piping systems for
Voting begins on:
the rehabilitation of existing
pipelines —
Voting terminates on:
Part 1:
Polyethylene (PE) material
Évaluation de la conformité des systèmes de canalisations en
plastique destinés à la réhabilitation des réseaux existants —
Partie 1: Matériau Polyéthylène (PE)
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
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INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
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Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 Assessment of conformity .2
3.2 Rehabilitation general .5
4 Abbreviated terms . 5
5 General . 6
6 Testing and inspection . 6
6.1 Grouping .6
6.1.1 General .6
6.1.2 Size groups .6
6.1.3 Fitting groups .6
6.2 Type testing .7
6.3 Batch release tests .7
6.4 Process verification tests .8
6.5 Audit tests .8
6.6 Indirect tests .8
6.7 Test records .8
Annex A (normative) Test procedures for plastics piping systems for the rehabilitation of
underground non-pressure drains and sewers . 9
Annex B (normative) Test procedures for plastics piping systems for the rehabilitation of
drains and sewers under pressure, and for water and gas supply networks . 14
Annex C (normative) Specification of new system (N), change in design (D), change in material
(M) and extension of the product range (E) .28
Annex D (normative) Testing and inspection of fabricated fittings .29
Annex E (normative) Summary tables of scheme requirements .32
Bibliography .35

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by ISO/TC 138 Plastics pipes, fittings and valves for the transport of fluids,
Subcommittee SC 8, Rehabilitation of pipeline systems, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping systems and ducting systems, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO/TS 23818-1:2020), which has been technically
revised.
The main changes are as follows:
— the document has been amended following the merging and renumbering of International Standards
concerning piping systems, referred to in this document.
— in Clause 3, seven definitions have been removed by reference to ISO 11295;
— the technique family "lining with spirally-wound pipes" has been excluded and the respective content
has been incorporated in ISO/TS 23818-4.
A list of all parts in the ISO/TS 23818 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
International Standards dealing with the following applications are either available or in preparation for
pipeline rehabilitation:
— ISO 11300: Piping systems for rehabilitation of underground drains, sewers and water supply networks;
— ISO 11301: Piping systems for rehabilitation of underground gas supply networks.
These International Standards are distinguished from those for conventionally installed plastics piping
systems by the requirement to verify certain characteristics in the as-installed condition, after site
processing. This is in addition to specifying requirements for plastics piping system components as
manufactured.
For the assessment of conformity, five technical specifications for pipe systems of distinctive materials are
applicable:
— ISO/TS 23818-1 (this document);
— ISO/TS 23818-2;
— ISO/TS 23818-3;
— ISO/TS 23818-4.
These technical specifications cover the International Standards concerning piping systems, as presented in
Table 1.
Table 1 — Structure of technical specifications for assessment of conformity
Application
Drains,
Technical
Material Technique
sewers and Gas supply
Specification
water supply networks
networks
Lining with continuous pipes and close fit pipes
ISO/TS 23818-1 PE trenchless replacement using pipe bursting, pipe ISO 11300-1 ISO 11301-1
extraction, horizontal drilling and impact moling
Thermoset com-
ISO/TS 23818-2 Lining with cured-in-place pipes (CIPP) ISO 11300-2 n/a
posite
ISO/TS 23818-3 PVC-U Lining with close-fit pipes ISO 11300-3 n/a
ISO/TS 23818- Thermoplastic Lining with spirally wound pipes and rigidly an-
ISO 11300-4 n/a
a
4 composite chored plastic liners (RAPL)
b b b
— PA-U — n/a   —
a
In preparation
b
Under development (as Part 5)
The format of technical specifications is in line with technical specifications for assessment of conformity to
other system standards, apart from presenting the detailed requirements for inspection and testing in two
annexes, for non-pressure applications and pressure applications (where applicable), respectively.
The format is schematically represented for this document in Figure 1.

v
Figure 1 — Format of the technical specifications for conformity assessment
Figures 2 and 3 are intended to provide general information on the concept of testing and organisation
of those tests used for the purpose of the assessment of conformity. For each type of test, i.e. type testing
(TT), batch release test (BRT), process verification test (PVT), and audit test (AT), this document details the
applicable characteristics to be assessed as well as the frequency and sampling of testing.
A typical scheme for the assessment of conformity of PE pipes, fittings, joints or assemblies by manufacturers
is given in Figure 2.
Figure 2 — Typical scheme for the assessment of conformity by a manufacturer
A typical scheme for the assessment of conformity of PE pipes, fittings, joints or assemblies by manufacturers,
including certification, is given in Figure 3.

vi
Figure 3 — Typical scheme for the assessment of conformity by a manufacturer,
including certification
vii
FINAL DRAFT Technical Specification ISO/DTS 23818-1:2025(en)
Assessment of conformity of plastics piping systems for the
rehabilitation of existing pipelines —
Part 1:
Polyethylene (PE) material
1 Scope
This document provides a scheme for the assessment of conformity of PE products and assemblies for
the rehabilitation of existing pipelines, in accordance with ISO 11300-1 and ISO 11301-1, and intended
to be included in the manufacturer’s quality plan as part of the quality management system and for the
establishment of certification procedures.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 4427-1, Plastics piping systems for water supply and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 1: General
ISO 4427-2, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 2: Pipes
ISO 4427-3, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 3: Fittings
ISO 4437-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General
ISO 4437-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes
ISO 4437-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
ISO 11295, Plastics piping systems used for the rehabilitation of pipelines — Classification and overview of
strategic, tactical and operational activities
ISO 11300-1, Piping systems for rehabilitation of underground drains, sewers and water supply networks —
Part 1: Polyethylene (PE) material
ISO 11301-1, Piping systems for rehabilitation of underground gas supply networks — Part 1: Polyethylene (PE)
material
ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Small-scale steady-state test (S4 test)
ISO 13478, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Full-scale test (FST)

3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11295, ISO 11300-1, ISO 11301-1
and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1 Assessment of conformity
3.1.1
certification body
impartial body, governmental or non-governmental, possessing the necessary competence and responsibility
to carry out certification of conformity according to given rules of procedure and management
[4]
Note 1 to entry: A certification body should preferably operate in accordance with ISO/IEC 17021-1 or
[6]
ISO/IEC 17065 .
3.1.2
inspection body
body that performs inspection
Note 1 to entry: An inspection body can be an organization, or part of an organization.
[3] [4]
Note 2 to entry: An inspection body should preferably operate in accordance with ISO/IEC 17020 or ISO/IEC 17021-1 .
[3]
[SOURCE: ISO/IEC 17020:2012, 3.5, modified — Note 2 to entry added.]
3.1.3
testing laboratory
laboratory which measures, tests, calibrates or otherwise determines the characteristics of the performance
of materials (3.1.13) and products
Note 1 to entry: In the context of this document, the materials and products can be subjected to type testing (3.1.6),
batch release test (3.1.7), process verification test (3.1.8), audit test (3.1.10), and witness test (3.1.12), as applicable.
[5]
Note 2 to entry: A testing laboratory should preferably operate in accordance with ISO/IEC 17025 .
3.1.4
quality management system
part of a management system with regard to quality
[2]
Note 1 to entry: Requirements for quality management systems are given in ISO 9001 .
[SOURCE: ISO 9000:2015, 3.5.4, modified — Note 1 to entry added.]
3.1.5
quality plan
document setting out the specific quality practices, resources and sequence of activities relevant to a
particular product or range of products
3.1.6
type testing
TT
testing performed to prove that the material (3.1.13), pipe, joint (3.1.21) or assembly (3.1.22) is capable of
conforming to the requirements given in the relevant standard
Note 1 to entry: The type test results should remain valid until there is a change in the material or product or assembly
provided that the process verification tests (3.1.8) are done regularly.

3.1.7
batch release test
BRT
test performed by or on behalf of the manufacturer on a batch of PE products, which has to be satisfactorily
completed before the batch can be released
Note 1 to entry: A batch can either be a material batch (3.1.14) or a product batch (3.1.16).
3.1.8
process verification test
PVT
test performed by or on behalf of the manufacturer on PE products at specific intervals to confirm that
the process continues to be capable of producing products which conform to the requirements given in the
relevant standard
Note 1 to entry: Such tests are not required to release batches of products and are carried out as a measure of process
control.
3.1.9
process verification test at the “I” stage
PVT-I
test performed by or on behalf of the manufacturer or installer at specific intervals during the installation
process to confirm that the process as specified in the installation manual continues to be capable of
producing installed products which conform to the requirements given in the relevant standard
Note 1 to entry: Such tests are not required to release batches of products and are carried out as a measure of process
control.
3.1.10
audit test
AT
test performed by a test laboratory on behalf of an inspection body (3.1.2) or certification body (3.1.1) to
confirm that the product continues to conform to the requirements given in the relevant standard
3.1.11
indirect test
IT
test performed by or on behalf of the manufacturer, different from that specified test for that particular
characteristic, having previously verified its correlation with the specified test
3.1.12
witness test
WT
test accepted by an inspection body (3.1.2) or a certification body (3.1.1) for type testing (3.1.6) and/or audit
test (3.1.10), which is carried out by or on behalf of the manufacturer and supervised by a representative of
the inspection or certification body, competent in testing
3.1.13
material
generic term for compositions grouped by families, expressed by generic names, e.g. polypropylene, stainless
steel, brass or EPDM
Note 1 to entry: Definition from European Commission, Directorate-General for Enterprise and Industry, Sub-group
on Product Testing Procedures (EC, DG ENT and IND, SG PTP).
3.1.14
material batch
clearly identified quantity of a given homogeneous compound manufactured under uniform conditions and
defined and identified by the compound manufacturer

3.1.15
product
pipe, fitting, or valve of a clearly identified type intended to be a part of a piping system which the
manufacturer puts on the market
3.1.16
product batch
clearly identified collection of products, manufactured consecutively or continuously under the same
conditions, using the same compound conforming to the same specification
Note 1 to entry: The production batch is defined and identified by the product manufacturer.
3.1.17
lot
clearly identifiable sub-division of a batch for inspection purposes
3.1.18
sample
one or more products drawn from the same production batch or lot (3.1.17), selected at random without
regard to their quality
Note 1 to entry: The number of products in the sample is the sample size.
3.1.19
group
collection of similar products from which samples (3.1.18) are selected for testing purposes
3.1.20
component
product manufactured out of a specific composition compound brought to the market as part of another
product or as a spare part.
Note 1 to entry: For drinking water application, components may be considered as products and be individually
approved (e.g. O-ring, gasket) or they are tested as an integral part of a finished product (e.g. in a valve).
3.1.21
joint
connection between two products
3.1.22
assembly
product that can be dismantled into a set of components (3.1.20)
EXAMPLE A test piece consisting of various products.
3.1.23
sampling plan
specification of the type of sampling to be used combined with the operational specification of the entities
or increments to be taken, the samples (3.1.18) to be constituted and the measurements or tests to be made
EXAMPLE A specific plan which indicates the number of units of products or assemblies to be inspected.
3.1.24
product type
generic description of a product
EXAMPLE A pipe or fitting or valve or their main parts, of the same design, from a particular compound.
3.1.25
cavity
space within a mould to be filled to form the moulded product
EXAMPLE That part of an injection mould which gives the form to the injection-moulded product.

3.2 Rehabilitation general
3.2.1
characteristic
property, dimension or other feature of a material (3.1.13) or component (3.1.20)
3.2.2
“M” stage
stage as manufactured, before any subsequent site processing of components (3.1.20) associated with the
particular renovation technique
3.2.3
“I” stage
stage as installed, i.e. in final configuration after any site processing of components (3.1.20) associated with
the particular renovation technique
3.2.4
nominal size
DN
numerical designation of the size of a component (3.1.20), which is a convenient round number
approximately equal to the inside or outside diameter in millimetres
3.2.5
nominal size
DN/OD
numerical designation of the size of a component related to the outside diameter
[SOURCE: ISO 4427-1:2019, 3.1.1, modified — Note 1 to entry deleted]
3.2.6
nominal outside diameter
d
n
specified outside diameter assigned to a nominal size DN/OD
Note 1 to entry: Expressed in millimetres.
[SOURCE: ISO 4427-1:2019, 3.1.2]
4 Abbreviated terms
To avoid misunderstanding, the assessment of conformity abbreviated terms in this Clause are defined
as being the same in each language. For the same reason, the terms are given in three languages, English,
French and German.
English French German
AT audit test essai d’audit Überwachungsprüfung
BRT batch release test essai de libération de Freigabeprüfung einer Charge
campagne de fabrication
IT indirect test essai indirect indirekte Prüfung
PVT process verification test essai de vérification du Prozessüberprüfung
procédé de fabrication
PVT-I process verification test essai de vérification du Einbauprozessprüfung
at the “I” stage procédé d’installation
TT type testing essai de type Typprüfung
WT witness test essai témoin Prüfung unter Aufsicht
Furthermore, the abbreviated terms given in ISO 1043-1 and the following apply.

PE polyethylene
PVC-U unplasticized poly(vinyl chloride)
5 General
Materials, products, joints and assemblies shall conform to the requirements given in ISO 11300-1 and
ISO 11301-1, as applicable.
Where these product standards include clauses entitled ‘Regional requirements’, in countries of the
single European market, conformity shall be assessed against certain different normative references
(EN equivalents of ISO standards where not yet merged as EN/ISO standards), as specified in the product
standards.
Products and assemblies shall be produced by the manufacturer under a quality management system which
includes a quality plan.
[2]
It is recommended that the quality management system conforms to ISO 9001 or similar management system.
The production of representative “I” stage samples for type testing shall conform to the requirements given
in ISO 11300-1 and ISO 11301-1, as applicable.
Testing and inspection shall be carried out in accordance with Clause 6. Additional requirements on
test procedures shall conform to Annexes A or B. Additional requirements on test conditions shall be in
accordance with Annex C. Additional requirements on fabricated fittings shall conform to Annex D.
Requirements on test regime shall be in accordance with Annex E.
6 Testing and inspection
6.1 Grouping
6.1.1 General
For the purposes of this document, the groups specified in 6.1.2 and 6.1.3 apply.
6.1.2 Size groups
Five size groups are defined for pipes and fittings, as given in Table 2.
For testing purposes, one individual nominal diameter, d , shall be selected from each group.
n
Table 2 — Size groups
Size group Nominal outside diameter,
d
n
mm
1 d < 75
n
2 75 ≤ d < 250
n
3 250 ≤ d < 710
n
4 710 ≤ d < 1 800
n
5 d ≥ 1 800
n
6.1.3 Fitting groups
Four groups of fittings each having a similar design are defined, as given in Table 3.

Table 3 — Fitting groups
Fitting group Type of fitting
(A) Electrofusion socket fitting
(B) Electrofusion saddle fitting
(C) Spigot end fitting
a
(D) Fabricated fitting
a
Not applicable for gas networks.
Fitting groups are divided in fitting types.
— Fitting group (A) includes the following fitting types: Electrofusion couplers, electrofusion 45˚ elbows,
electrofusion 90˚ elbows, electrofusion tees, electrofusion reducers, electrofusion end caps.
— Fitting group (B) includes the following fitting types: Electrofusion tapping saddles, electrofusion branch
saddles.
— Fitting group (C) includes the following fitting types: 45˚ elbows, 90˚ elbows, tees, reducers, end caps.
— Fitting group (D) includes the following fitting types: Swept bends, segmented bends, segmented tees.
6.2 Type testing
Relevant type testing shall be carried out on every new system and whenever there is a change in design,
material, production or installation method, other than routine in-process adjustments, and whenever there
is an extension of the product range.
Type testing to be carried out when there is a change of production site depends on the extent of the change
and should therefore be defined individually by the manufacturer and certification body.
For other change conditions, characteristics to be type tested and sampling procedures shall be in
accordance with the following subclauses of Annex A and Annex B:
— A.1 TT for systems applied to underground non-pressure drains and sewers.
— B.1 TT for systems applied to drains and sewers under pressure and water and gas networks.
The following abbreviated terms are used to identify change conditions requiring new type testing in the
respective tables of A.1 and B.1:
— N: New system;
— D: Change in design;
— M: Change of material;
— E: Extension of the product.
Detailed definitions of these change conditions are provided in Annex C.
6.3 Batch release tests
Characteristics to be batch release tested and sampling procedures shall be in accordance with the following
subclauses of Annex A and Annex B:
— A.2 BRT for systems applied to underground non-pressure drains and sewers.
— B.2 BRT for systems applied to drains and sewers
under pressure and water and gas networks.

6.4 Process verification tests
Process verification tests include tests conducted at the “M” stage (PVT) and, where applicable, tests carried
out at the “I” stage (PVT-I).
The sample or process parameter shall be in accordance with ISO 11300-1, or ISO 11301-1, as applicable,
ISO 4427 series, or ISO 4437 series, as applicable.
If a sample or process parameter does not conform to these requirements, the relevant retest procedure
detailed in the manufacturer’s quality plan should be performed.
For countries of the single European Market ISO 8772 is replaced by EN 12666-1, ISO 4427 series is replaced
by EN 12201 and ISO 4437 series is replaced by EN 1555.
NOTE Failure to meet the required installation process parameters does not necessarily preclude successful
installation.
Characteristics to be process verification tested and sampling procedures shall be in accordance with the
following subclauses of Annex A and Annex B:
— A.3 PVT and PVT-I for systems applied to underground non-pressure drains
and sewers.
— B.3 PVT and PVT-I for systems applied to drains and sewers
under pressure and water and gas networks.
6.5 Audit tests
Characteristics to be audit tested and sampling procedures shall be in accordance with the following
subclauses of Annex A and Annex B:
— A.4 AT for systems applied to underground non-pressure drains and sewers.
— B.4 AT for systems applied to drains and sewers
under pressure and water and gas networks.
6.6 Indirect tests
Generally, testing shall be performed using the test methods specified in ISO 11300-1 or ISO 11301-1, as
applicable.
Indirect testing may be used for BRT characteristics as given in the tables in A.2 and B.2, as applicable.
Indirect testing shall not be used for TTs, PVTs and ATs.
The indirect test method used and the correlation or safe relationship of the indirect testing to the specified
testing shall be documented in the manufacturer’s quality plan. The continuing validity of the indirect
testing shall be checked at regular intervals.
In cases of dispute, the BRTs as specified in the tables in A.2 and B.2, as applicable, shall be used.
If certification is involved, the IT shall be undertaken in a manner that is acceptable to the certification body.
6.7 Test records
Unless otherwise specified, all records shall be maintained for a minimum of ten years in accordance with
the information given in the quality management system.

Annex A
(normative)
Test procedures for plastics piping systems for the rehabilitation of
underground non-pressure drains and sewers
A.1 Type testing
For the purposes of this document, the material specification consists of a compound/formulation
comprising a polyethylene (PE) compound/formulation with specific trade name and additives with known
dosage level.
Type tests shall demonstrate that the products conform to all requirements for the characteristics given in
Tables A.1 and A.2, as applicable.
Table A.1 — Characteristics of pipes that require type testing (TT)
Conditions requiring
Reference to
Sampling procedure
a
test
applicable
Characteristic
clause of
Certification
N D M E Manufacturer
ISO 11300-1 b
body
Melt mass-flow rate
5.3 + + Once per material Once per material
(MFR-value)
Resistance to Once per material in Once per material in
5.3 + +
internal pressure a single optional size a single optional size
Thermal stability (OIT) 5.2 + + Once per material Once per material
Appearance 5.2 + + + + Once per size Once per size group
Density 5.3 + + Once per material Once per material
Colour 5.2 + + + Once per size Once per size group
Dimensions 5.4 + + + Once per size Once per size group
Once per SN class/ Once per SN class/
Ring stiffness 5.5 + + +
material material
Once per SN class/ Once per SN class/
Creep ratio 5.5 + + +
material material
Longitudinal reversion 5.6 + + + + Once per size Once per size group
By checking the test
Marking 5.8 + + Once per size results of the manu-
facturer
Once per size By checking the test
Memory ability 5.6 + + + + results of the manu-
facturer
Tensile strength longitu-
5.3 + + Once per material Once per material
dinal
Elongation at break 5.3 + + Once per material Once per material
Installation
practice 9 + + + + Once per size Once per size group
compliance
a
Explanation in 6.2 and Annex C; +: Test to be carried out.
b
Recommended sampling procedure for a testing laboratory on behalf of a certification body.

Table A.2 — Characteristics of fittings that require type testing (TT)
Conditions
Sampling procedure
Reference to
a
requiring test
Characteristic applicable clause of
Certification
ISO 11300-1
N D M E Manufacturer
b
body
Melt mass-flow rate
+ + Once per compound Once per compound
(MFR-value)
Resistance to inter- Once per material in Once per material in
+ +
c
nal pressure a single optional size a single optional size
Thermal stability
+ + Once per material Once per material
c
(OIT)
Once per each Once per fitting
Appearance + + +
6.1 fitting group
Once per each Once per fitting
Colour 6.2 + + +
fitting group
6.3 Once per each Once per size group
Dimensions + + + +
fitting and fitting group
Flexibility or
Once per each Once per fitting
mechanical + + +
fitting group
d
strength
Once per fitting
+ + Once per size
group
Effect of heating
Once per size group
Once per material
and fitting group
Once per each Once per fitting
Watertightness + +
fitting group
A.2 Batch release testing
The characteristics specified in ISO 11300-1 and listed in Tables A.3 and A.4, shall be subject to BRTs with
the minimum sampling frequency given in Tables A.3 and A.4, as applicable.
Table A.3 — Characteristics of pipes and minimum sampling frequencies for BRTs
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Appearance 5.2 Once per 8 h and start up
Colour 5.2 Once per 8 h and start up
Diameter 5.4 Once per extrusion run
Wall thickness 5.4 Once per 8 h and start up
Length of pipe 5.4 Once per 8 h and start up
Longitudinal reversion 5.6 Once per week and start up
Memory ability 5.6 Once per 8 h and start up
Marking 5.8 Once per 2 h and start up

Table A.4 — Characteristics of fittings and minimum sampling frequencies for BRTs
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Appearance Once per 8 h and start up
Colour Once per 8 h and start up
Diameter Once per 8 h and start up
Wall thickness Once per 8 h and start up
6.1
Socket and spigot dimensions Once per 8 h and start up
6.2
Effect of heating Once per week and start up
One sample for each type of
Water tightness
fabricated fitting/8 h
Marking Once per 8 h and start up
The manufacturer shall specify a batch in its quality plan.
A batch or lot shall only be released for supply when all the relevant tests and inspections have been carried
out at least once at the specified frequencies and the requirements have been met.
If a product fails in respect of any characteristic given in Tables A.3 or A.4 as applicable, the batch or lot shall
be rejected, or the retest procedures shall be performed for the characteristic on which the product failed.
The retest procedure shall be as follows:
— Find the last product, which conforms to the requirements as specified in ISO 11300-1
— Release all products produced before that point and reject the products produced after that point.
Procedures for dealing with rejected products shall be detailed in the manufacturer’s quality plan.
A.3 Process verification testing
Those characteristics specified in ISO 11300-1 and listed in Tables A.5 and A.6 shall be subject to PVTs and
PVT-Is with the minimum sampling frequencies given in Tables A.5 and A.6, as applicable, if not type tested
or audit tested in the same period.
Table A.5 — Characteristics of pipes and minimum sampling frequencies
for PVTs and PVT-I’s
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Resistance to internal pressure Once per year per material
currently used in a single
optional size
Thermal stability (OIT) Once per year per material
currently used
5.3
5.5
Melt mass-flow rate (MFR-value) Once per year per material
currently used
Ring stiffness Once per year per material
currently used and size group
and pipe series
Installation practice compliance 9 Once per installation

Table A.6 — Characteristics of fittings and minimum sampling frequencies for PVTs and PVT-I’s
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Resistance to internal pressure Once per year per material
currently used in a single
optional size
Thermal stability (OIT) Once per year per material
currently used
a
Melt mass-flow rate (MFR-value) 6.1 Once per year per material
currently used
b
Flexibility or mechanical strength Once per year per size group
per socket design
Tightness of elastomeric sealing ring Once per 2 years per size group and
c
joints joint design
a
Not to be repeated for fittings material when the material is the same as for pipes and already tested for that purpose.
b
Only for fabricated fittings made from more than one piece. A sealing ring retaining mean is not considered as a piece.
c
Joint design at least includes: seal design, groove geometry and seal hardness (t 5 IHRD).
If the product does not conform to the requirements in respect of any characteristic given in Tables A.5 and
A.6, as applicable, the retest procedure detailed in the manufacturer's quality plan shall be performed. If the
retest procedure does not confirm conformity of the product to the requirements, then the process shall be
investigated and corrected in accordance with the procedures given in the manufacturer's quality plan, as
well as to verify the characteristics given in Tables A.5 and A.6, as applicable.
A test performed as an AT does not need to be repeated as a PVT and/or PVT-I.
A.4 Audit testing
ATs are only performed where certification is involved.
Those characteristics specified in ISO 11300-1 and listed in Tables A.7 to A.9 are intended to be audit tested
with the minimum sampling frequency given in Tables A.7 to A.9, as applicable.
Table A.7 — Characteristics of pipes and minimum sampling frequencies for ATs
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Once per year per material
Melt mass-flow rate (MFR-value) 5.3
currently used
Once per 3 years per materials
Resistance to internal pressure 5.3 currently used in a single
optional size
Once per year per material
Thermal stability (OIT) 5.3
currently used
Appearance 5.2 Once per year per size group
Colour 5.2 Once per year per size group
Dimensions 5.4 Once per year per size group
Ring stiffness 5.5 Once per year per size group
Creep ratio 5.5 Once per 5 year per size group
Longitudinal reversion 5.6 Once per year per size group
Memory ability 5.6 Once per year per size group
Tensile strength longitudinal 5.3 Once per year per size group

TTabablele A A.77 ((ccoonnttiinnueuedd))
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Elongation at break 5.3 Once per year per size group
Marking 5.8 Once per year per size group
Installation practice compliance 9 Once per 5 year
Table A.8 — Characteristics of fittings and minimum sampling frequencies for ATs
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Once per year per material
a
Melt mass-flow rate (MFR-value)
currently used
6.1
Once per 3 years per materials
Resistance to internal pressure currently used in a single
optional size
6.2 Once per year per material
Thermal stability (OIT)
currently used
Appearance Once per year per fitting group
Colour Once per year per fitting group
Dimensions Once per year per fitting group
Ring stiffness Once per year per fitting group
6.1
Creep ratio Once per year per fitting group
6.2
Longitudinal reversion Once per year per fitting group
b
Effect of heating Once per year per fitting group
Marking Once per year per fitting group
a
Not to be repeated for fittings material when the material is the same as for pipes and already tested for that purpose.
b
Only for injection moulded parts.
Table A.9 — Characteristics for fitness for purpose of the system and minimum sampling
frequencies for ATs
Reference to applicable
Characteristic Minimum sampling frequency
clause of ISO 11300-1
Tightness of elastomeric sealing ring
6.1 Once per year on one size
joints
a
Joint design at least includes: seal design, groove geometry and seal hardness (t 5 IHRD).
The sizes, types and classes selected for tests should preferably be primarily those which have not previo
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